That's moving the goal posts. Who's interpretation? Sunni? Shia? Wahhabi?

And then HG Wells time machine actually does exist, or did I take the book out of context?

Ask them what the context is supposed to be and see if they actually have any clue what it is. Pretty embarrassing for them when they can't answer.

This Gentleman tells it like it is..probably in a Kuaiti Prison by now...

Asking for hard evidence or other kinds of verifiable proof is always a solid strategy, but you will run into people who mistake the verse in the book for the objective truth and you have to continue to point out that it is NOT. HTH

Ask them "Well, how else am I supposed to take passages such as "Slay the unbelievers wherever you find them?"".

Ask them to provide the evidence to support their belief. They will use scripture or Koranic text to do so, and it will become a circular argument. My advice is to try to avoid these sort of situations, it is not any benefit to us for them to change their beliefs we are not trying to convert them to atheism. I just ask that they do us the same courtesy.

I don't know... I don't criticize or ridiculize... religion, any or all.

Simply respond with the surrounding text if indeed it does support your position. If it doesn't, it would have been better not to say anything at all.